$OpenBSD: patch-xprop_xprop_c,v 1.1 2017/05/04 13:14:55 jca Exp $
--- xprop/xprop.c.orig
+++ xprop/xprop.c
@@ -46,6 +46,9 @@ from The Open Group.
 char *getenv();
 #endif
 
+void remove_property();
+void Show_Prop();
+
 #define MAXSTR 10000
 
 #define min(a,b)  ((a) < (b) ? (a) : (b))
@@ -581,6 +584,7 @@ char *Format_Bool(value)
 static char *_buf_ptr;
 static int _buf_len;
 
+void
 _put_char(c)
      char c;
 {
@@ -1347,6 +1351,7 @@ char **argv;
  *
  */
 
+void
 remove_property (dpy, w, propname)
     Display *dpy;
     Window w;
@@ -1502,6 +1507,7 @@ char *Get_Property_Data_And_Type(atom, length, type, s
 	  return(Get_Window_Property_Data_And_Type(atom, length, type, size));
 }
 
+void
 Show_Prop(format, dformat, prop)
      char *format, *dformat, *prop;
 {
